//CORNILLEZ, JAZEL HANNE C

//CCP 1103 - ITBC

//FIBONACCI FACTORIAL

​

using System;

public class Program

{

    public static void Main()

    {

        string inputNumber;

        long input; 

        long [] fibonacciArray;

        long product = 1; 

        long factorial = 0; 

        long firstNumber = 0;

        long secondNumber = 1;

        long temporary = 1;

        Console.WriteLine("Fibonacci Factorial.");

        Console.WriteLine();

        Console.Write("Enter a number: ");

        inputNumber = Console.ReadLine();

​

        if (long.TryParse(inputNumber, out input) == true)

        {

            fibonacciArray = new long[input];

            if (input > 50) 

            {

                Console.WriteLine("Number greater than 50 is not allowed.");

            }

            else if (input <= 0) 

            {

                Console.WriteLine("Zero or negative input is not allowed.");    

            }

            else 

            {

                for (int j = 0; j < input; ++j) {

                    if (j == 1)

                    {

                        fibonacciArray[j] = temporary;

                    }

                    else

                    {

                        temporary = firstNumber + secondNumber;             

                        fibonacciArray[j] = temporary;      

                        firstNumber = secondNumber;                     

                        secondNumber = temporary;

                    }       

                }

                for (int z = 0; z < input; ++z) {

                    product = 1; 

                    for (long y = fibonacciArray[z]; y > 0; y--) { 

                        product *= y;   

                    }

                    factorial += product;

                }   

                Console.WriteLine("The Fibonacci Factorial for {0:#,0} is {1:#,0}.", input, factorial);

            }

        }                        

        else 

        {

            Console.WriteLine("Invalid Input. Please enter a valid input.");

        }       

    }

}